CAJ | 학술논문

基于ANSYS有限元分析平台建立了新疆某风电场1．5Mw双馈风力发电机（double—fed induction generator，DFIG）的2维电磁场模型。基于有限元法对双馈发电机正常运行工况、单相接地短路、两相稳态短路时磁力线分布和气隙磁密分布进行了计算，分析了不对称短路故障对双馈发电机的影响。结果表明：在发生不对称短路故障时，双馈风力发电机的气隙磁场明显畸变，漏磁增多，其附加铁耗及定子表面铁耗显著增加；发生单相接地短路故障时的上述损耗均比两相短路故障时大；在发电机中感生的谐波电动势会引起发电机机械振动和噪声。
기우ANSYS유한원분석평태건립료신강모풍전장1．5Mw쌍궤풍력발전궤（double—fed induction generator，DFIG）적2유전자장모형。기우유한원법대쌍궤발전궤정상운행공황、단상접지단로、량상은태단로시자력선분포화기극자밀분포진행료계산，분석료불대칭단로고장대쌍궤발전궤적영향。결과표명：재발생불대칭단로고장시，쌍궤풍력발전궤적기극자장명현기변，루자증다，기부가철모급정자표면철모현저증가；발생단상접지단로고장시적상술손모균비량상단로고장시대；재발전궤중감생적해파전동세회인기발전궤궤계진동화조성。
Based on finite element analysis platform ANSYS, a two-dimensional electromagnetic field model of doubly fed induction generator （DFIF）, whose capacity is 1.5MW and is installed in a certain wind farm located in the Xinjiang Uygur Autonomous Region, is established. Using finite element analysis, the distribution of magnetic line of force in DFIG and the distribution of air-gap flux density under normal operation conditions, single-phase earth fault and two-phase short-circuit fault occurred in DFIG are calculated, and the influences of asymmetrical short-circuit on DFIG are analyzed. Analysis results show that asymmetrical short-circuit occurred in DFIG leads to evident distortion of its air-gap magnetic field and flux leakage increases, and its additional iron loss and surface iron loss of stator remarkably increase; above mentioned iron losses under single-phase earth fault is bigger than those under two-phase short-circuit fault; the harmonic emf induced in DFIG will lead to magnetic vibration and noise of induction generator.